pnfs: Proper delay for NFS4ERR_RECALLCONFLICT in layout_get_done
An NFS4ERR_RECALLCONFLICT is returned by server from a GET_LAYOUT only when a Server Sent a RECALL do to that GET_LAYOUT, or the RECALL and GET_LAYOUT crossed on the wire. In any way this means we want to wait at most until in-flight IO is finished and the RECALL can be satisfied. So a proper wait here is more like 1/10 of a second, not 15 seconds like we have now. In case of a server bug we delay exponentially longer on each retry. Current code totally craps out performance of very large files on most pnfs-objects layouts, because of how the map changes when the file has grown into the next raid group. [Stable: This will patch back to 3.9. If there are earlier still maintained trees, please tell me I'll send a patch] CC: Stable Tree <stable@vger.kernel.org> Signed-off-by: NBoaz Harrosh <bharrosh@panasas.com> Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>
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